Using the technique advice I got on working my quarterpanel, it went very well. I worked the rough edges down with an air board, then blocked it with 80-grit and then with 180-grit. I had to fill a few little pinholes and I thought I got them all, but when I applied the Z-Chrom Rust Defender, there is a big pinhole about the size of the end of a pencil lead. I guess in my excitement for everything going so well, I jumped the gun and shot the primer before I made a thorough inspection. Since the Z-Chrome is sprayable filler, can I use some Metal Glaze to fille the pinhole? Also, the Z-Chrome literature says that it serves as a sealer. Can I use this as the last material before a topcoat? If so, what grit paper should I finish it to before spraying the topcoat? I assume that if I'm able to use the glazing putty on top of the Z-Chrome AND use it as a sealer, I'll need to shoot another couple of coats to cover the glazing putty. Correct?